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Standard XII
Chemistry
Question

Which of the following is incorrect regarding the structural features of borax?
  1. It has two tetrahedral and two triangular units
  2. All the boron atoms are not in same hybrid state
  3. Only one boron atom has a lone pair of electrons
  4. Each boron atom of a pair is tetravalent

A
All the boron atoms are not in same hybrid state
B
It has two tetrahedral and two triangular units
C
Only one boron atom has a lone pair of electrons
D
Each boron atom of a pair is tetravalent
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Solution
Verified by Toppr

In the structure of borax, none of the boron atoms have lone pairs of electrons.
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Q1
Borax is actually made of two tetrahedral and two triangular units joined together and should be
written as : Na2[B4O5(OH)4].8H2O.
Consider the following statements about borax:
1. Each boron atom has four B-O bonds
2. EAch boron atom has three B-O bonds
3. Two boron atoms have four B-O bonds while other two have three B-O bonds
4. Each boron atom has one-OH groups
Select correct statement(s) -
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Q2

Borax is actually made of two tetrahedra and two triangular units joined together and should be written as: Na2[B4O5(OH)4]·8H2O

The correct statement/s about borax is/are:

a. Each boron atom has four B-O bonds

b. Each boron atom has three B-O bonds

c. Two boron atoms have four B-O bonds while other two have three B-O bonds

d. Each boron atom has one -OH groups


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Q3
Boron has two isotopes, 10B and 11B whose relative abundances are 20% and 80% respectively. Atomic weight of boron is:
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Explain the following :
Boron trichloride has triangular planar geometry whereas aluminium trichloride has tetrahedral dimeric structure.

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